Engineering of Self-Aggregation-Resistant MnO2 Heterostructure with A Built-in Field for Enhanced High-Mass-Loading Energy Storage

Jinxin Wang, Wei Guo, Zongxu Liu, Qiuyu Zhang

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Although MnO2 has been intensively investigated for energy storage, further applications are limited by van der Waals force-triggered self-aggregation that always leads to poorly exposed active sites and compromised reaction dynamics, especially under high-mass-loading conditions. Herein, by synergistically coupling interfacial modulation with the Kirkendall effect, this work achieves in situ topological structure reorganization of MnOOH toward the high-aspect-ratio MnO2 heterostructure (Heter-MnO2) with fully exposed active sites, which is ready to assemble into self-supporting high-mass-loading film (30 mg cm−2) with restrained self-aggregation. Theoretical calculation and dynamics analysis results demonstrate the generation of the built-in field within the heterostructure, thus enhancing the electronic-transfer and ionic-adsorption/transport rates. As such, the 30 mg cm−2 Heter-MnO2 electrode achieves a superior areal capacitance of 4762 mF cm−2 at 1 mA cm−2 and a sound rate performance (79% at 100 mA cm−2) comparable to those of low-mass-loading/thin-film electrodes. As a proof of concept, the fabricated planar interdigital quasi-solid-state symmetric micro-supercapacitor (MSC) based on the Heter-MnO2 electrode can deliver a remarkable areal capacitance of 181 mF cm−2 and a considerable volumetric energy density of 10.3 mWh cm−3. This methodology highlights the promise of surface/interface chemistry modulation for the configuration of easy-to-integrate hierarchical nanostructures to better meet practical energy applications.

Original languageEnglish
Article number2300224
JournalAdvanced Energy Materials
Volume13
Issue number20
DOIs
StatePublished - 25 May 2023

Keywords

  • MnO heterostructure
  • built-in field
  • high-mass-loading energy storage
  • interfacial modulation
  • micro-supercapacitors

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